WooCommerce Subscriptions 6.2.0

* Fix: WooCommerce 3.0: Correctly handle switching between grouped products in WooCommerce 3.0 where a product can have more than one parent grouped product. PR#2063
* Fix: Do not incorrectly create pending renewal orders and suspend PayPal Standard Subscriptions at the time their payment is due. PayPal controls the billing schedule for these subscriptions. PR#2069
* Tweak: Add 'woocommerce_subscriptions_order_type_dropdown' filter. PR#2065

* Fix: WooCommerce 3.0: Improve backward compatibility of get_date( 'start' ) calls for subscriptions without a date created set by WooCommerce 3.0 (which happens when manually adding a new subscriptions). PR#2047
* Fix: WooCommerce 3.0: Prevent saving subscriptions with a 0 start date/date created by making sure we set a default date created value when manually adding a new subscription. PR#2048
* Fix: WooCommerce 3.0: Remove the correct 3.0 core function responsible for sending order emails to avoid sending both WooCommerce order emails and Subscriptions order emails. PR#2045
* Fix: WooCommerce 3.0: Make sure synchronised product meta data is set correctly on subscriptino line items by using WooCommerce 3.0 compatible hook. PR#2049
* Fix: Make sure filters are applied when getting customer subscriptions with REST API endpoints by using WC_API_Subscriptions::get_subscriptions() instead of a custom query to get customer subscriptions. PR#1806
* Fix: Display correct variable subscription product "From" prices and grouped subscription products prices to match tax settings. PR#2054
* Fix: Don't attempt to save shipping and billing fields which aren't set when submitting the Edit Subscription screen to avoid notices. PR#2053
* Fix: Don't use method return value in write context in REST API to avoid errors on certain versions of PHP. PR#2051

* Fix: WooCommerce 3.0: Fix using $this when in a static context on newer versions of PHP affecting Edit Subscription and Edit Order screens. PR#2043
* Fix: WooCommerce 3.0: Grant new product download permissions to all subscriptions because WooCommerce no longer does it for orders (and subscriptions are a custom order type). PR#2039
* Fix: WooCommerce 3.0: Display subscription related System Status fields in the System Status page on 3.0 which removed old hooks. PR#2039
* Fix: WooCommerce 3.0: Fix updating payment method and elsewhere via the Edit Subscription administration screen. PR#2037
* Fix: WooCommerce 3.0: Store correct prorated price for switches against the order line item so it can be used for future switches. PR#2032